Electric switch.



No. 876,701. PATENTED JAN.14, 1908. H. DREWELL.

ELECTRIC SWITCH.

APPLICATION FILED MAR. 9. 1907.

F' ,2, 1 2 s a w 91 1 1 1'9;

\A m TNESSE5 INVENTOR 'd I B QQ HEINRICH DREWELL, or CHARLOTTENBURG, GERMANY.

ELECTRIC SWITCH Specification of Letters Patent.

Patented Jan.'14, 1908.

Application filed March 9- 1907. Serial No. 361-589.

To all whom it may concern:

Be it known that I, HEINRICH DREWELL,

Emperor, residing at Germany, have invented control the branches of a divided circuit with a number of switches or interrupters which smaller than the number of the branches.

In certain connections which are already known there are switches whichcan operate simultaneouslyand which accordingly may be mechanically connected one with another. One part of these switches has moreover the characteristic feature that the one switchpole consists of a plurality of contacts which are insulated one from another when the switch is open, the other pole'on the contrary consisting only of one common piece. If the insulated contacts are connected when the switch-is open, shunts are. formed which are capable of disturbing the intended manner in which the switches should operate. An important object of the present invention is to remove this disturbing effect of the shunts. in all the branches of the circuit which are capable of forming shunts, said devices permitting the passage of anelectric currentin only one direction. Such a device is, for example, an electrolytic cell with an aluminium electrode, so-called valve-cell, or an arrangement in which a loose carbon contact is influenced by a polarized magnet or the like.

In order that the invention may be clearly understood reference is made to the accompanying drawing in which two connections In accordance with the present invention are shown diagrammatica 1y by way. of example in Figures 1 and 2.

Referring to Fig. 1, a and b are branching points of the circuit in which the battery f is situated, to each of which points a series of three switches, c and (1 respectively, are connected. These switches are on the other hand connected with the individual branches 1 to 9 of the circuit, namely, each Improvements in Electric It is attained by inserting devices these C0118 being with one group of three branches. The branches 1 to 9 contain all the devices 0, valve-cells or other devices, which allow an electric current to pass in one direction only. Now in order that only one branch may receive current when two switches are closed, one switch being ata and one at b, the connection must be such that each group of branches, which for exam leis connected by one of the switches 0 tot e one pole of the source of current f, has one of the branches 1 to 9 in common with each of the grou s which are connected by the switches d to t e other pole of the source of current f. It follows from this, of course, that the grou s of branches at the switches c and 01 must e differently composed If two switches are closed, the one being at V4: and the other at d,

that branch which is common to the connected a and b and thus between the' oles of the source of current; this branch t 'erefore receives current. Shunt's however exist in this connection. For example, when the center switches c and d are closed, a current can on the one handass directly along the branch 5 from a to Further, the additional paths over the branches 4, 1, 2 and 6, 9, 8, for example, are possible for the current. These are shunt clrcuits, and in order to be able to pass them the current must flow in the branches 1 and 1). Consequently such shunt circuits are nullified when valve cells, or other are inserted in thebranches 1 to allow an electric current to direction (from a to 1)) only.

2 shows another connection employing llke means for nullifying shunt circuits. The switches g and h in Fig. 2 take the place of the switches c and d in Fi 1. The switches h are here dependent on t e switches g in such a manner that when one ofthe switches g (with the exception of the first) 9 which pass in one is closed, a switch It is simultaneously oper-' ated by the action of coils 'i, the circuits of closed by, the switches g. The branches I to XV of the circuit of the battery Z. are connected in groups with the switches -g and h. The groups of the branches are in this case soformed. and connected that each of the groups of branches which are connected to one of the switches g has one branch in common with all the devices (4,.

9 in a direction opposite to the normal direction frofn id to switch 9, the branch nected to the iexample branch "groups oi branches which are connected with .than that of vices were employed, there would be several shunts if anypair of the switches g is closed. For instance, if the second and switches g are closed,, the electric current might flow through the second switch-contact g to the branches the branch III and from here to thefifth of the switches'h, which is closed by the corresponding coil i confifth switch gj The-branches VI and'VII form further unintended shunts. To formany oneof the' shunts however it is necessary that the electric current canflow through one of the branches I to IXop'po-j site to'its normal direction. Theseshunts be avoided by: inserting in may therefore I to 'XV"de,vices 7a; through the branches which the electriccurrent canjpass in one;

direction only.

\ switches, conductors;

(e or'k)' may be increased or d m nished in a Y 1. In means for closiof acircuit which is divided into a plurality wit theone se branch inco branches connected? to It is evident that both arrangements;

shown ,in- Figs. 1 and 2,.1the number of shunts, andy'de'vices suitable manner for fany given purpose without departing mm the spirit an the resent invention. p

'I e above described connections. in "accordance with-the present invention may be employed for transr'nitting combinations of telegraphic current in type-printing, as

'Well as for the automatic operation of'typemachines, in which e'struckand types; or matrices areitobe released according to. the combination of holes'ofa register'band.

writing and typesett' machines keys are to' 'What I claim as my invention and desire to secure by Letters atent 1s:

of branches, the combination of a series of switches, a source of current, conductors connecting said switches with one pole of said 7 source of current, another series of'switches, "conductors connecting the latter withthe other pole otsaid' source of current and a lurality of branch conductors arrange in groups connected with said sets of switches in oups'; feach'group' of branches connected d es offswitches' having one 11 with the groups of the other series of V, VI, VII and IX and from the branches backward through the branch II to source of current,

switches each'havmg and one' end of sa scope; of,

an optional branch 7' switches, with a'plurality of devices adapted to permit the'passage' of an electric current in one direction oniy, ing inserted in each of said branches as set forth.v I

2.. In means for closing an optional branch of a circuit which is divided into a plurality one of said devices bcof branches, the combination of a series of switches, a source of current, conductors connecting said; switches with one pole of; said source of current, another series ofswitches,

conductors connecting other pole of the latter with the I said source of current and a plurality of branch conductors arranged 1n oups, said groups of branch conductors be.- mg each connected in order toswitches of one of said series of switches and said branch conductors being connected in order-in different groups to switches of the other series of switches, whereby shunts are rovided'for thecurrent flowm in a branch one of said'series o aplurality of devices adapted to permit the passage of tion only,

one of saiddevices being inserted in each of said shunts asset forth.

3; In means for closing an optional branch I Ofa circuit which is divided into a plurality switches, a source of current, conductorscon nectmg said switches w th onefpole of 'sa1d a seriesyo j ducto'rs connecting ectly from v switches to the O h l an electric current in one direc-' g of branches-,the combination of a series ofautomatic an r i s il, on-25 sa d]automatic-switches coil with the other pole of said sourceof current,a plurality of conduc'-- f;

tors connect order with all switches, and a plurality tors arranged in, groups connected with said; .set of switches in groups,

branches connected --'the;0 ther end ofsaid coilsin. ut one of said former'series of-Ij I,

of branch ;conduc-": v

. aehi' 'g'roup of .With the-p 16 .seriespof switches having one branch in common with all the 7 cups 0 ed to t eswitches of, higher number of the; of the concerned switch in the former" series, with a plurality other series than that branches which are connectofjdevices adapted permit the passage of i an electric current. in'one' direction only, one

of saiddevices branch set .fort

bemglinserted each of said 4. Means for-closinga -tfitieiiii which (if aicircuitwhich is divided intoa plurality of branches, comprising n comb nation a series of switches, a source of current conductors connecting. said switches with llpole of said source .of current, ano h switches, conductors connect ng-Itlie'ilatter" oi. urrent,.g in? with the other pole of said source a plurality of branch conductors r serie ast groups'connected-with said setof-switc difierent groups, each oup of branches con nected with the one SBIIQSOf switcheshavxngf one branch in. common branches connected :to the otherfsenesofy:

withthe groups 0 switches,-Whereby shunts'are provided for name to this specification in the presence of the current flowing in a branch directly contwo subscribing Witnesses. necting two switches of said two series of switches, and a plurality of polarized cells,- 5 one of the latter being inserted in each of said Witnesses:

shunts as set forth. WOLDEMAR HAUPT, In testimony whereof I have signed my HENRY HAsPER.

HEINRICH DREVVELL. 

